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Modeling and Experimental Validation of Cell Morphology in Microcellular-Foamed Polycaprolactone
Donghwan Lim1, Sanghyun Lee2, Seungho Jung3
1Department of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
Polymers
|October 16, 2024
Summary
This study models cell morphology in microcellular-foamed polycaprolactone using supercritical carbon dioxide. The developed model accurately predicts cell density, aiding in optimizing foaming processes for biomaterials and industrial applications.
Area of Science:
- Materials Science
- Polymer Engineering
- Chemical Engineering
Background:
- Microcellular foaming processes (MCP) are crucial for tailoring polymer properties.
- Supercritical carbon dioxide (scCO2) is an effective blowing agent for creating microcellular structures.
- Understanding cell morphology is key to optimizing polymer foaming.
Purpose of the Study:
- To develop and experimentally validate a model for cell morphology in microcellular-foamed polycaprolactone (PCL).
- To predict cell density using modified classical nucleation theory and numerical analysis.
- To provide a tool for optimizing MCP conditions for various polymers.
Main Methods:
- Solid-state batch foaming of PCL with scCO2 at varying pressures and temperatures.
- Modeling PCL-CO2 solubility and density using Sanchez-Lacombe and Peng-Robinson-Stryjek-Vera equations of state.
- Numerical analysis integrating gas absorption kinetics and nucleation theory, validated with field-emission scanning electron microscopy.
Main Results:
- Accurate prediction of cell density in microcellular-foamed PCL.
- Demonstrated influence of depressurization rate and saturation pressure on cell growth.
- Validation of the predictive model against experimental and reference data.
Conclusions:
- A robust method for predicting cell density in scCO2-foamed polymers was established.
- The study offers a Python-based tool for optimizing MCP parameters.
- Findings have broad applicability in biomaterials and industrial manufacturing.
